关键词: 高含硫天然气, 净化装置, 腐蚀特征, 腐蚀规律, 泄漏, 酸性气, 高温硫, 制造缺欠

Abstract:

There are relatively few standards and specifications related to the engineering construction, equipment manufacturing, and material selection of high sulfur natural gas purification units, and most of them adopt or refer to the standards of the petroleum refining industry. Since the Natural Gas Purification Plant of Puguang Gas Field was put into operation in 2009, high sour gas corrosion, as well as the coupling corrosion of multiple factors such as sour gas, manufacturing defects, and material defects, have caused multiple leaks of equipment and facilities, becoming the main problem that restricts the safe, efficient, and long-term operation of the plant. Through statistical analysis of abnormal events over the years, equipment inspection and maintenance records, and pressure vessel pipeline inspection records, the key corrosion areas, influencing factors, and corrosion mechanisms of high sulfur purification units are summarized. It is found that wet hydrogen sulfide corrosion, high-temperature sulfur corrosion, sulfur dioxide corrosion, and underdeposit corrosion are the main corrosion forms; the distribution patterns of corrosion are summarized from region, category, and inducement, corrosion in desulfurization and sulfur recovery systems accounts for over 80%; typical corrosion cases based on factors such as hydrogen sulfide, liquid sulfur, and manufacturing defects are analyzed in detail, and corrosion prevention and control measures are proposed for high sulfur natural gas purification units.

Key words: high sulfur natural gas, purification unit, corrosion characteristic, corrosion pattern, leakage, sour gas, high-temperature sulfur, manufacturing defects